Improvement in cross-heads



J. W. HILL.-

CROSSHEAD.

Patented Nov.zs,1a75.

PATENT OFFICE.

JOHN w. HILL, 0E DAYTON, OHIO.

IMPROVEMENT IN CROSS-HEADS.

Specification forming part of Letters'Patent No. 170,370, dated November 23, `1875; application filed July 31, 1815.

To all whom it may concern.- v

Be it known that I, JOHN W. HILL, of Dayton, in the county of Montgomery and State of Ohio, have invented a certain Improvement in Cross-Heads, of which the following is a specilication:

This invention is designed to improve the construction of that kind of expansible crossheads forl steam-engines and other machines where such expansion is effected by a longitudinal adjustment of brasses or shoes seated on inclined surfaces on the cross-head. It consists in providing the set-screws used for adjusting the shoes withjam-nuts, so arranged and applied as to prevent all movement of both the set-screws and the shoes after adjustment, so that the shoes cannot jam the cross-head in the guides, the use of the jamnuts permitting the most accurate adjustment without detachment of any of the parts.

In the annexed drawings, Figure lis a plan View of a cross-head-- embodying my invention. Fig. 2 lis a longitudinal section in the plane ot' .the axes of the adjusting-screws. Fig. 3 is a transverse section thereof'.

The same letters of reference are used in all the iigures in the designa-tion of identical parts.

In the example illustrated, the lnain body A of the cross-head, which is provided with a socket, A1, for the recept-ion of the head of the piston-rod, and an eye, A2, for the attachment ot' the pitm'an, is made tapering, forming inclined surfaces at the side edges. To these inclined surfaces the brasses or shoes B and B are iitted, made wedge-shaped or tapering longitudinally, so that when applied to the main body of the cross-head their respective exterior sides, which are to bear on the guides, will be strictly parallel to each other. The bearing-surfaces of the shoes are in this instance of V form. To prevent side wise movement of the shoes on the head A they are provided each with a longitudinal tongue, b, fitting corresponding grooves a in the head. Each shoe has at the 'larger-end an inwardly-projecting lug, b', through an eye in which a set screw, C, passes, entering a tapped hole in the head A. By means of the set-screws C, which bear, with a large collar, c, against the lugs b', the shoes can be forced up the inclined surfaces on the head A, to expand it iii/width, as may be required. Each set-screw carries a jam-nut, C', which, after adjustment of the shoes, is screwed up tightly against the lug b', and prevents the accidental turning of the set-screw at the same time that it locks the shoe by clamping it against the collar c.

This mode of adjusting the shoes and locking the parts after adjustment possesses peculiar and important-advantages over the use,

for instance, of fixed screw-bolts projecting from the cross-head through the ears of the shoes, and provided with nuts for forcing the shoes up the inclines to expand the crosshead, a number of shims being interposed between the cross-head and the ears of the shoes.

It will be at once perceived that by my means an accurate adjustment may be effected Wit-hout detachment ol' any ofthe parts or the adding or removing 'of any pieces, all of which is necessary in the instance alluded to, and even then it will be exceedingly difcult to eect a delicate adjustment in that way.

What Iclaim as my invention, and desire to secure by Letters Patent, is

The combination of the tapering head, wedge-shaped or tapering shoes, set-screws, and jam-nuts, `substantially as and for the purpose specified.

In testimony whereof I have signed my name to the foregoing yspeciiication in the presence of two subscribing witnesses.

J OHN W. HILL.

Witnesses: j

LOUIS DIETER, E. L. 'WASHBURN' 

